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Based on STP structure, Sealing bellows is added in SPW. The pressure-proof and elastic stainless steel bellows is tightly seal-welded to the valve stem and upper adapter ring. For safety reasons the construction includes a standard stem sealing as back-up in case of bellows failure.
SPW series is available for process fluids when stem leakage can't be tolerated at all (e.g. toxic fluids).
■ Standard Specification
Valve Body
Type: Cast globe Valve
Nominal Size: DN 15, 20, 25, 32, 40, 50, 65, 80, 100,
150, 200, 250, 300
Nominal Pressure: ANSI 150, 300
DIN PN16, 25, 40
JIS 10K, 20K, 30K
GB PN1.6, 2.5, 4.0 MPa
End Connection: Flange ANSI B16.5 RF, RTJ
DIN2543/2544/2545 RF
JISB2201 RF
JB/T81 RF
JB/T82.2 FM
Weld: ANSI B16.5 SW（DN≤50）; BW（DN＞50）
Face to Face Dimension:
ANSI150RF, JIS10K （IEC60534-3-1 37 Series）
ANSI300RF, JIS20K, JIS30K （IEC60534-3-1 38 Series）
ANSI150/300 RTJ （ASME B16.10 CLASS 150/300RTJ）
DIN PN16, 25, 40 （DIN3202-F1）
GB PN1.6, 2.5, 4.0 MPa （ISO5752 1 Series）
Please refer to table 6.1~6.4
Body Material：Please refer to table1 Please refer to figure 3 for Operated Temp. &Pressure Range
Bonnet Type：Bellows type……-46℃～350℃
(Please pay attention to the different Temp. &Pressure Range of material)
Packing Material：PTFE V-ring compound packing、graphite compound packing、
graphite packing,
Operating Temp. &Pressure range is shownn in table 2，figure2
Seal Gasket：Spiral wound gasket（PTFE+316、Flexible Graphite+316）,
Graphite with metal gasket（Graphite+316、Graphite+304）
Valve Trim
Plug Type：Parabolic column plug
Flow Characteristic：EQ%、Linearity、Quickly opening(Please refer to figure4)
Trim Material：Please refer to table 3 for STD material assembly，operated Temp. &Pressure Range
Bellows Material：0Cr18Ni12Mo2Ti(316Ti)
Actuator
Type：Multi-spring diaphragm
Air Supply：Max. 6bar
Ambient Temp.：-20℃~+80℃
Spring range：As shown in Table 5.1～5.5
Air Connection：G1/8（SA1）；G1/4（SA2）；G3/4（SA3）
STD Specification：As shown in Table 5.1～5.5
